CLHS: Section 4.3.4.1

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## 4.3.4.1 Examples of Inheritance

     (defclass C1 ()
         ((S1 :initform 5.4 :type number)
          (S2 :allocation :class)))

     (defclass C2 (C1)
         ((S1 :initform 5 :type integer)
          (S2 :allocation :instance)
          (S3 :accessor C2-S3)))

Instances of the class `C1` have a local slot named `S1`, whose default initial value is 5.4 and whose value should always be a number. The class `C1` also has a shared slot named `S2`.

There is a local slot named `S1` in instances of `C2`. The default initial value of `S1` is 5. The value of `S1` should always be of type `(and integer number)`. There are also local slots named `S2` and `S3` in instances of `C2`. The class `C2` has a method for `C2-S3` for reading the value of slot `S3`; there is also a method for `(setf C2-S3)` that writes the value of `S3`.

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